We should have our students ________ hard instead of ________ too much time playing games.

it at the school gate，if I may ask, _______you met your friends from your hometown

Does the dish taste as _________ as it used to be—No, I don’t think I have ever eaten a worse one.

I bought the telephone here yesterday but it _________ work.

下列各句中，加点的成语使用恰当的一项是(　　)